High spatial entanglement via chirped quasi-phase-matched optical parametric down-conversion
High spatial entanglement via chirped quasi-phase-matched optical parametric down-conversion
By making use of the spatial shape of paired photons, parametric down-conversion allows the generation of two-photon entanglement in a multidimensional Hilbert space. How much entanglement can be generated in this way? In principle, the infinite-dimensional nature of the spatial degree of freedom renders unbounded the amount of entanglement available. …